The home arcade hit its peak several years ago. And the mame cabinets are what is killing it. It used to be that plenty of well-off people would buy 5 and six games for their basement and they would want the BIG NAME stuff. Galaga, Ms. Pac-Man, Asteroids, Star Wars.
It used to be that the hardcore game collectors AND the casual players BOTH were heavily after the top 25 titles.
Those same buyers have ditched their machines for Mame cabinets and the value of the top 25 has been falling and it will continue to fall, they were overpriced anyway.
Meanwhile Jamma games are on the rise pricewise, as a new generation of buyers looks for THEIR favorite games, which were from a decade later.
Enthusiasts, real enthusiasts will still have a room or house full of machines, but the casual owners (a category that is actually growing) are moving more and more towards having a single Mame cabinet (or 9 in 1), and maybe a driving game.
This is good news for us enthusiasts, but bad news for those who THINK they are sitting on a fortune with their classics.
Some stuff is going to stay sky high though, and that is niche stuff, the stuff that the general public doesn't even care about, but that the collectors go crazy for. Vectorbeam games, laserdisc games, Warlords, Crazy Climber, stuff like that.